/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.anywide.dawdler.clientplug.web.session.base;

/**
 * @author jackson.song
 * @version V1.0
 * @Title CookieSupport.java
 * @Description cookie相关操作 直接copy tomcat中的代码
 * @date 2016年6月16日
 * @email suxuan696@gmail.com
 */
public final class CookieSupport {

    // --------------------------------------------------------------- Constants
    /**
     * If set to true, we parse cookies strictly according to the servlet, cookie
     * and HTTP specs by default.
     */
    public static final boolean STRICT_SERVLET_COMPLIANCE;

    /**
     * If true, cookie values are allowed to contain an equals character without
     * being quoted.
     */
    public static final boolean ALLOW_EQUALS_IN_VALUE;

    /**
     * If true, separators that are not explicitly dis-allowed by the v0 cookie spec
     * but are disallowed by the HTTP spec will be allowed in v0 cookie names and
     * values. These characters are: \"()/:<=>?@[\\]{} Note that the inclusion of /
     * depends on the value of {@link #FWD_SLASH_IS_SEPARATOR}.
     */
    public static final boolean ALLOW_HTTP_SEPARATORS_IN_V0;

    /**
     * If set to false, we don't use the IE6/7 Max-Age/Expires work around. Default
     * is usually true. If STRICT_SERVLET_COMPLIANCE==true then default is false.
     * Explicitly setting always takes priority.
     */
    public static final boolean ALWAYS_ADD_EXPIRES;

    /**
     * If set to true, the <code>/</code> character will be treated as a separator.
     * Default is usually false. If STRICT_SERVLET_COMPLIANCE==true then default is
     * true. Explicitly setting always takes priority.
     */
    public static final boolean FWD_SLASH_IS_SEPARATOR;

    /**
     * The list of separators that apply to version 0 cookies. To quote the spec,
     * these are comma, semi-colon and white-space. The HTTP spec definition of
     * linear white space is [CRLF] 1*( SP | HT )
     */
    private static final char[] V0_SEPARATORS = { ',', ';', ' ', '\t' };
    private static final boolean[] V0_SEPARATOR_FLAGS = new boolean[128];

    /**
     * The list of separators that apply to version 1 cookies. This may or may not
     * include '/' depending on the setting of {@link #FWD_SLASH_IS_SEPARATOR}.
     */
    private static final char[] HTTP_SEPARATORS;
    private static final boolean[] HTTP_SEPARATOR_FLAGS = new boolean[128];

    static {
        STRICT_SERVLET_COMPLIANCE = Boolean
                .valueOf(System.getProperty("org.apache.catalina.STRICT_SERVLET_COMPLIANCE", "false")).booleanValue();

        ALLOW_EQUALS_IN_VALUE = Boolean
                .valueOf(System.getProperty("org.apache.tomcat.util.http.ServerCookie.ALLOW_EQUALS_IN_VALUE", "false"))
                .booleanValue();

        ALLOW_HTTP_SEPARATORS_IN_V0 = Boolean.valueOf(
                System.getProperty("org.apache.tomcat.util.http.ServerCookie.ALLOW_HTTP_SEPARATORS_IN_V0", "false"))
                .booleanValue();

        String alwaysAddExpires = System.getProperty("org.apache.tomcat.util.http.ServerCookie.ALWAYS_ADD_EXPIRES");
        if (alwaysAddExpires == null) {
            ALWAYS_ADD_EXPIRES = !STRICT_SERVLET_COMPLIANCE;
        } else {
            ALWAYS_ADD_EXPIRES = Boolean.valueOf(alwaysAddExpires).booleanValue();
        }

        String fwdSlashIsSeparator = System
                .getProperty("org.apache.tomcat.util.http.ServerCookie.FWD_SLASH_IS_SEPARATOR");
        if (fwdSlashIsSeparator == null) {
            FWD_SLASH_IS_SEPARATOR = STRICT_SERVLET_COMPLIANCE;
        } else {
            FWD_SLASH_IS_SEPARATOR = Boolean.valueOf(fwdSlashIsSeparator).booleanValue();
        }

        /*
         * Excluding the '/' char by default violates the RFC, but it looks like a lot
         * of people put '/' in unquoted values: '/': ; //47 '\t':9 ' ':32 '\"':34
         * '(':40 ')':41 ',':44 ':':58 ';':59 '<':60 '=':61 '>':62 '?':63 '@':64 '[':91
         * '\\':92 ']':93 '{':123 '}':125
         */
        if (CookieSupport.FWD_SLASH_IS_SEPARATOR) {
            HTTP_SEPARATORS = new char[] { '\t', ' ', '\"', '(', ')', ',', '/', ':', ';', '<', '=', '>', '?', '@', '[',
                    '\\', ']', '{', '}' };
        } else {
            HTTP_SEPARATORS = new char[] { '\t', ' ', '\"', '(', ')', ',', ':', ';', '<', '=', '>', '?', '@', '[', '\\',
                    ']', '{', '}' };
        }
        for (int i = 0; i < 128; i++) {
            V0_SEPARATOR_FLAGS[i] = false;
            HTTP_SEPARATOR_FLAGS[i] = false;
        }
        for (int i = 0; i < V0_SEPARATORS.length; i++) {
            V0_SEPARATOR_FLAGS[V0_SEPARATORS[i]] = true;
        }
        for (int i = 0; i < HTTP_SEPARATORS.length; i++) {
            HTTP_SEPARATOR_FLAGS[HTTP_SEPARATORS[i]] = true;
        }

    }

    // ----------------------------------------------------------------- Methods

    // ------------------------------------------------------------- Constructor
    private CookieSupport() {
        // Utility class. Don't allow instances to be created.
    }

    /**
     * Returns true if the byte is a separator as defined by V0 of the cookie spec.
     */
    public static final boolean isV0Separator(final char c) {
        if (c < 0x20 || c >= 0x7f) {
            if (c != 0x09) {
                throw new IllegalArgumentException("Control character in cookie value or attribute.");
            }
        }

        return V0_SEPARATOR_FLAGS[c];
    }

    public static boolean isV0Token(String value) {
        if (value == null)
            return false;

        int i = 0;
        int len = value.length();

        if (alreadyQuoted(value)) {
            i++;
            len--;
        }

        for (; i < len; i++) {
            char c = value.charAt(i);

            if (isV0Separator(c))
                return true;
        }
        return false;
    }

    /**
     * Returns true if the byte is a separator as defined by V1 of the cookie spec,
     * RFC2109.
     *
     * @throws IllegalArgumentException if a control character was supplied as input
     */
    public static final boolean isHttpSeparator(final char c) {
        if (c < 0x20 || c >= 0x7f) {
            if (c != 0x09) {
                throw new IllegalArgumentException("Control character in cookie value or attribute.");
            }
        }

        return HTTP_SEPARATOR_FLAGS[c];
    }

    public static boolean isHttpToken(String value) {
        if (value == null)
            return false;

        int i = 0;
        int len = value.length();

        if (alreadyQuoted(value)) {
            i++;
            len--;
        }

        for (; i < len; i++) {
            char c = value.charAt(i);

            if (isHttpSeparator(c))
                return true;
        }
        return false;
    }

    public static boolean alreadyQuoted(String value) {
        if (value == null || value.length() < 2)
            return false;
        return (value.charAt(0) == '\"' && value.charAt(value.length() - 1) == '\"');
    }
}
